OptionalLong ifPresent(LongConsumer) method in Java with examples
Last Updated :
17 Apr, 2023
The ifPresent(java.util.function.LongConsumer) method helps us to perform the specified LongConsumer action the value of this OptionalLong object. If a value is not present in this OptionalLong, then this method does nothing.
Syntax:
public void ifPresent(LongConsumer action)
Parameters: This method accepts a parameter action which is the action to be performed on this Optional, if a value is present.
Return value: This method returns nothing.
Exception: This method throw NullPointerException if a value is present and the given action is null.
Below programs illustrate ifPresent(LongConsumer) method:
Program 1:
Java
import java.util.OptionalLong;
public class GFG {
public static void main(String[] args)
{
OptionalLong oplong
= OptionalLong.of(23456745678L);
oplong.ifPresent((value) -> {
value = Math.round(value * 0.19 );
System.out.println("Value after modification:=> "
+ value);
});
}
}
|
Output: Program 2:
Java
import java.util.OptionalLong;
public class GFG {
public static void main(String[] args)
{
OptionalLong oplong = OptionalLong.empty();
oplong.ifPresent((value) -> {
value = value * 132435 ;
System.out.println("Value:=> "
+ value);
});
System.out.println("As OptionalLong is empty value"
+ " is not modified");
}
}
|
Output: References: https://docs.oracle.com/javase/10/docs/api/java/util/OptionalLong.html#ifPresent(java.util.function.LongConsumer)
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